When moving the object, the obj will jump from slow to fast, vice versa if held down long enough. I had it at what seemed a steady speed, but that was before i read that section in the SFML book. In which that said to add a second while loop in for logic updates as opposed to rendering. The theory sounds good, but i cannot figure out why i cannot get it to work. This process is new to me as in Pygame i just used clock.tick(60), but i am assuming that it used an internal sleep method for 60 FPS.
well anyway, this is the code. It is not exactly like the book, as i was trying to implement into my style. The problem lies in Control::update()
#include <SFML/Window.hpp>
#include <SFML/Graphics.hpp>
#include <iostream>
class Rect{
public:
int speed = 100;
sf::Vector2f position;
sf::RectangleShape rect;
bool moving_up = false,
moving_down = false,
moving_right = false,
moving_left = false;
Rect(){
position = {100,100};
rect.setSize(sf::Vector2f(100,100));
rect.setPosition(position);
rect.setFillColor(sf::Color::Red);
}
void update(sf::Time delta){
sf::Vector2f movement(0,0);
if (moving_up)
movement.y -= speed;
if (moving_down)
movement.y += speed;
if (moving_left)
movement.x -= speed;
if (moving_right)
movement.x += speed;
move(movement * delta.asSeconds());
rect.setPosition(position);
}
void move(sf::Vector2f movement){
position += movement;
}
};
class Control{
public:
sf::RenderWindow window;
sf::Clock clock;
sf::Time frame_time = sf::seconds(1.f/60.f);
sf::Time time = sf::Time::Zero, update_time = sf::Time::Zero;
Rect obj;
Control(){
window.create(sf::VideoMode(600,400), "Title");
//window.setKeyRepeatEnabled(false);
}
void update(sf::Event event){
time = clock.restart();
update_time += time;
while(update_time > frame_time){
update_time -= frame_time;
obj.update(time);
}
render();
}
void render(){
window.clear(sf::Color::Black);
window.draw(obj.rect);
window.display();
}
void input_handler(sf::Keyboard::Key key, bool is_pressed){
if (key == sf::Keyboard::W)
obj.moving_up = is_pressed;
else if (key == sf::Keyboard::S)
obj.moving_down = is_pressed;
else if (key == sf::Keyboard::D)
obj.moving_right = is_pressed;
else if (key == sf::Keyboard::A)
obj.moving_left = is_pressed;
}
void event_handler(sf::Event event){
while(window.pollEvent(event)){
if (event.type == sf::Event::Closed)
window.close();
else if (event.type == sf::Event::KeyPressed)
input_handler(event.key.code, true);
else if (event.type == sf::Event::KeyReleased)
input_handler(event.key.code, false);
}
}
void run(){
while (window.isOpen()){
sf::Event event;
event_handler(event);
update(event);
}
}
};
int main(){
Control app;
app.run();
}
